Abstract: Zalman's CNPS10X Extreme fulfills both roles pretty well care of a cleverly integrated PWM fan speed controller in the top part of the fan shroud. Do nothing and the CNPS10X Extreme's 120mm fan will fall under BIOS control, automatically scaling fan speed from 1000RPM to 2150RPM as needed.

It's easy to overlook the Zalman CNPS10X Extreme for just another CPU cooler, instead of the flexible low noise and high performance tower heatsink it is.
Most heatsinks often fall into one category or the other, not both... at least not very
well.

Zalman's CNPS10X Extreme fulfills both roles pretty well care of a cleverly integrated PWM fan speed controller in the top part of the fan shroud. Do nothing and the CNPS10X Extreme's 120mm fan will fall under BIOS control, automatically
scaling fan speed from 1000RPM to 2150RPM as needed. Set the fan speed
controller and the heatsink operates in one of three fan-duty modes, or responds
to the turn of a dial to the exact fan velocity you want.

At full tilt the Zalman CNPS10X Extreme delivers performance cooling results on both
Intel and AMD test platforms, as you'll see a little later in Frostytech's
review. As a low noise heatsink the CNPS10X Extreme is pretty quiet (~36dBA),
while still maintaining good cooling results. The CNPS10X Extreme heatsink stands 161mm tall,
putting out of reach for some slim line cases, but its 130x100mm footprint is a
pretty compact.

Constructed from five 6mm diameter copper heatpipes, a
copper base plate and aluminum fins, the entire heatsink has been dark nickel
plated for appearance sake and weighs in at a hefty 920grams. That's heavier
than you'd expect just by glancing at it, but thankfully the retention brackets
install easily and without the need to rip apart the PC. Zalman's CNPS10X
Extreme heatsink is compatible with Intel socket 775/1156/1366 and AMD socket
754/939/AM2/AM3 processors. It's priced around $70.

By far the most unique aspect of the Zalman CNPS10X Extreme heatsink is
the integrated PWM fan speed controller. It allows direct user control over
the heatsink's noise output at the touch of a button. The
controller comes docked at the top of the fan shroud, or can be
slid out remotely located up to 80cm away via a supplied extension wire.

A bit of
double sided tape is supplied with the heatsink so the controller can be stuck
to
the side of a case (within
80cm of the heatsink) if you want to adjust fan speeds constantly. Incidently, the round
bit is not the button, it's the paddle next to it that acts as
the button.

Mounting Method and Hardware

Zalman's
CNPS10X Extreme heatsink can be used with socket 775/1156/1366 Intel processors, and the full
range of AMD chips - socket 754/939/940/AM2/AM2+/AM3 inclusive. Every
major CPU variation is covered by this one heatsink, good for those planning a
transition to Core i7 in the coming months, for example.

Installation is pretty straightforward, although there are some clearance issues to be aware of. Generally speaking, the
CNPS10X Extreme will fit any modern motherboard. If you're concerned about fit, the CNPS10X
Extreme requires about 70mm space from the center of the CPU above and below, back and front. Zalman note that at least 165mm space above the CPU itself is needed, although the heatsink Frostytech tested is only 161mm tall.

The AMD
mounting clip makes use of the stock plastic AMD heatsink retention frame. A stainless steel
clip fits over the central nub on the heatsink's base cap, and without tools
locks into the existing retention tabs. The heatsink should always be oriented
with airflow exhausting towards the rear of the PC case if
possible.

Both
Intel socket 1366 and 775/1156 processors make use of a special
plastic frame which is attached onto the motherboard prior to the
Zalman CNPS10X Extreme installation. No tools are required for the LGA775/1156 frame, and the motherboard can stay in place. For Core i7 LGA1366 processors you'll need to remove the board to
screw the bracket in from the rear. Thereafter a steel bracket locks onto the base of
the CNPS10X Extreme and applies correct clamping force with spring tensioned machine screws. The system firmly holds the 920gram heatsink in place, without making it difficult to swap
out processors in the future.

This
heatsink will be tested on FrostyTech's Intel LGA775 and K8 version of the Mk.II
synthetic thermal temperature test platform, and compared against a hundred
reference LGA775 and K8 heatsinks. The whole test methodology is outlined in detail here if you'd like to know what equipment is
used, and the parameters under which the tests are conducted.